Downgrade coverage version
Downgrade coverage version

A bug exists in `coverage` that makes it compatible with
`code-climate-reporter`.

Output from `code-climate-reporter`:

```
Consider locking your version of Coverage.py to >4,0,<4.4 until the
following Coverage.py issue is addressed:
https://bitbucket.org/ned/coveragepy/issues/578
```

Brickstertwo/git-commands